Lm-sensors gives a high temperature of 6000 degrees and a lot of questions about it?

Question

Hard disks

Here is a screenshot:

On board ubuntu server.
/etc/init.d/lm-sensors restart doesn't help, reinstalling too.
As you can see, it gives out a high temperature of more than 6000 degrees Celsius, which is absurd, because. The neighbors haven't flooded yet. It gives out a bunch of lines with incomprehensible (for me) devices and their temperature.
Questions:
1. What should I do to show the temperature correctly? What to read?
2. What is in1, in2, etc.?
3. What is fan1, fan2, etc.?
4. In general, what does each line mean? Temp 1, 2, 3 - it is also not clear what temperature is shown.
5. Does ALARM mean high voltage? Or how? What tension? (question 2) how can i control the current then pancake??? Or is everything in Linux so flexible that this is also possible?
6. What is the optimal temperature for devices? Which one should you keep?

Answer 1

similar to the temperature on the surface of the sun. Do you have hardware not from Sun by any chance?
Seriously,
1) 6k degrees shows the video card driver (nouveau). Apparently it works crookedly with your card, write a bug report
2) and 3) voltage and fan speed sensors. What corresponds to what depends only on the imagination of the motherboard manufacturer, establishes empirically.
4) the same story, depends on the mat. fees.
In /etc/sensors.conf, you can set human names for different sensors and it seems that you can adjust the temperature scales.

Answer 2

- fan * is a cooler, well, the RPM readings are their revolutions ...